How to add a birthday/celebration when making ADRs online?

[Blessed_wth_Triplets]

I just realized this is the first time I made all our ADRs online...and wanted to add that we will be celebrating our anniversary on our trip...is there any way to go about doing that? thanks!

 

[dtstampz]

Pull up your dining reservations on WDW, and for each one, click on "view details".
Scroll down & it should give you the option to "add a celebration".